Cross language text categorization by acquiring multilingual domain models from comparable corpora

  • Authors:
  • Alfio Gliozzo;Carlo Strapparava

  • Affiliations:
  • ITC-Irst, Trento, Italy;ITC-Irst, Trento, Italy

  • Venue:
  • ParaText '05 Proceedings of the ACL Workshop on Building and Using Parallel Texts
  • Year:
  • 2005

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Abstract

In a multilingual scenario, the classical monolingual text categorization problem can be reformulated as a cross language TC task, in which we have to cope with two or more languages (e.g. English and Italian). In this setting, the system is trained using labeled examples in a source language (e.g. English), and it classifies documents in a different target language (e.g. Italian). In this paper we propose a novel approach to solve the cross language text categorization problem based on acquiring Multilingual Domain Models from comparable corpora in a totally unsupervised way and without using any external knowledge source (e.g. bilingual dictionaries). These Multilingual Domain Models are exploited to define a generalized similarity function (i.e. a kernel function) among documents in different languages, which is used inside a Support Vector Machines classification framework. The results show that our approach is a feasible and cheap solution that largely outperforms a baseline.